Global worming: A periodically ordered mesoporous gel demonstrates photoregulated peristaltic motion induced by a nonlinear oscillating Belousov–Zhabotinsky reaction. The amplitude and period of the motion can be controlled by adjusting the intensity of visible light irradiation (see picture). Peristaltic motion of the gel surface can be observed by the change in structural color based on the reflection from the photonic bandgap of the gel.
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Shinohara et al. (2008) studied this question.
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